A new ionic conjugated polymer with pentafluorobenzoyl moieties, poly(2-ethynyl-N-pentafluorobenzoylpyridinium chloride) [PEPBPC], was synthesized via the non-catalyst polymerization of 2-ethynylpyridine using pentafluorobenzoyl chloride. The polymerization proceeded well to provide a high yield of polymer. The chemical structure of PEPBPC was characterized by such instrumental methods as NMR (H-1- and C-13-), IR, and UV-visible spectroscopies to have a conjugated polymer backbone system with N-pentafluorobenzoylpyridinium chloride as substituents. Photoluminescence maximum peak of PEPBPC was located at 627nm, which corresponds to the photon energy of 1.98eV. Cyclic voltammograms of polymer exhibited the electrochemically stable window in the range of -1.25 to 1.75V.